package com.nowcoder.community.entity;

/**
 * 封装分页相关的信息
 */
public class Page {

    /**
     * 默认情况下，Page的current的值是1,limit是10
     */
    //当前页码
    private int current =1;
    //显示每页的数量
    private int limit=10;


    //数据总数(用于计算总页数)
    private int rows;
    //查询路径(用于复用分页的链接)
    private String path;

    public int getCurrent() {
        return current;
    }

    public void setCurrent(int current) {
        if(current>=1){
            this.current = current;
        }
    }

    public int getLimit() {
        return limit;
    }

    public void setLimit(int limit) {
        if(limit>=1 && limit<=100){
            this.limit = limit;
        }
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        if(rows>=0){
            this.rows = rows;
        }
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    /**
     * 获取当前页的起始行
     */
    public int getOffset(){
        return (current-1)*limit;
    }

    /**
     * 获取总的页数
     */
    public int getTotal(){
        if(rows % limit ==0){
            return rows/limit;
        }else{
            return (rows/limit)+1;
        }
    }

    /**
     * 获取起始页码
     */
    public int getFrom(){
        int from = current -2;
        return from < 1?1:from;
    }

    /**
     * 获取结束页码
     */
    public int getTo(){
        int to =current +2;
        int total = getTotal();
        return to>total?total:to;
    }
}
